VP of Sales makes an appearance, along with a new requirement – make the marble run work with a larger size marble. Some of the teams are up to the challenge and begin testing their prototypes in-progress with the larger marble. Other teams find it difficult to get access to a larger marble to use.
Regardless, with about 15 minutes to go, most teams are “alpha” testing their prototypes and making adjustments – a marble must be able to make it from the beginning of the run to the end, landing in a cup.